[Amps] Step start

Radio WC6W wc6w_amps at yahoo.com
Sun Feb 3 19:17:14 EST 2008


Hi Patrick,
  I've done it, by means of your proposed method, on
supplies ranging from 12 to 3000 volts.

  I've mostly employed a TL431 for the sensor/relay
driver.  

73 & Good afternoon,
  Marv WC6W 

http://wc6w.50webs.com/


--- Patrick Egloff <pegloff at gmail.com> wrote:

> Hi All,
> 
> The purpose of a step-start is (mainly) to let the
> HV caps load smoothly.
> 
> The "classical" way to make a step-start is to short
> the resistor in the HV
> transformer primary with a relay switched after a
> delay made with an RC.
> This delay is mostly arbitrary put to 1 or 2 s.
> 
> Why not switch this relay with a divider from the HV
> voltage ? With the
> right divider, you ensure that the caps are really
> loaded and not supposed
> to be ?
> 
> Just a guess...
> 
> 73, Patrick.
> 
> -- 
> Patrick Egloff - TK5EP
> email : pegloff at gmail.com
> Fax : +33 826 698 954
> Web page : http://tk5ep.free.fr
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> 



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